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/*
* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "internal/cryptlib.h"
#include "internal/thread_once.h"
struct openssl_ctx_st {
CRYPTO_RWLOCK *lock;
CRYPTO_EX_DATA data;
};
static OPENSSL_CTX default_context;
static int context_init(OPENSSL_CTX *ctx)
{
return (ctx->lock = CRYPTO_THREAD_lock_new()) != NULL
&& CRYPTO_new_ex_data(CRYPTO_EX_INDEX_OPENSSL_CTX, NULL,
&ctx->data);
}
static int context_deinit(OPENSSL_CTX *ctx)
{
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_OPENSSL_CTX, NULL, &ctx->data);
CRYPTO_THREAD_lock_free(ctx->lock);
return 1;
}
static CRYPTO_ONCE default_context_init = CRYPTO_ONCE_STATIC_INIT;
static void do_default_context_deinit(void)
{
context_deinit(&default_context);
}
DEFINE_RUN_ONCE_STATIC(do_default_context_init)
{
return OPENSSL_init_crypto(0, NULL)
&& context_init(&default_context)
&& OPENSSL_atexit(do_default_context_deinit);
}
OPENSSL_CTX *OPENSSL_CTX_new(void)
{
OPENSSL_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL && !context_init(ctx)) {
OPENSSL_CTX_free(ctx);
ctx = NULL;
}
return ctx;
}
void OPENSSL_CTX_free(OPENSSL_CTX *ctx)
{
if (ctx != NULL)
context_deinit(ctx);
OPENSSL_free(ctx);
}
static void openssl_ctx_generic_new(void *parent_ign, void *ptr_ign,
CRYPTO_EX_DATA *ad, int index,
long argl_ign, void *argp)
{
const OPENSSL_CTX_METHOD *meth = argp;
void *ptr = meth->new_func();
if (ptr != NULL)
CRYPTO_set_ex_data(ad, index, ptr);
}
static void openssl_ctx_generic_free(void *parent_ign, void *ptr,
CRYPTO_EX_DATA *ad, int index,
long argl_ign, void *argp)
{
const OPENSSL_CTX_METHOD *meth = argp;
meth->free_func(ptr);
}
int openssl_ctx_new_index(const OPENSSL_CTX_METHOD *meth)
{
return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_OPENSSL_CTX, 0, (void *)meth,
openssl_ctx_generic_new, NULL,
openssl_ctx_generic_free);
}
void *openssl_ctx_get_data(OPENSSL_CTX *ctx, int index)
{
void *data = NULL;
if (ctx == NULL) {
if (!RUN_ONCE(&default_context_init, do_default_context_init))
return 0;
ctx = &default_context;
}
CRYPTO_THREAD_read_lock(ctx->lock);
/* The alloc call ensures there's a value there */
if (CRYPTO_alloc_ex_data(CRYPTO_EX_INDEX_OPENSSL_CTX, NULL,
&ctx->data, index))
data = CRYPTO_get_ex_data(&ctx->data, index);
CRYPTO_THREAD_unlock(ctx->lock);
return data;
}
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